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It's important to note that the article you mentioned (https://qliksupport.force.com/articles/000055708) helps only if the issue is the websocket timing out due to inactivity. Otherwise, you've set what you need to with the VP session timeout. So, the next thing to check would be any other pieces of networking equipment between the Qlik server and the browser.
You can also use the websocket connectivity tester (https://support.qlik.com/articles/000038601) to help determine at what level the websocket becomes disconnected, which may help in further troubleshooting.